public override Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight)
{
Widget handle = new Padding(
padding: EdgeInsets.only(right: 26.0f, bottom: 26.0f),
child: new SizedBox(
width: MaterialUtils._kHandleSize,
height: MaterialUtils._kHandleSize,
child: new CustomPaint(
painter: new _TextSelectionHandlePainter(
color: Theme.of(context).textSelectionHandleColor
)
)
)
);
switch (type)
{
case TextSelectionHandleType.left: // points up-right
return(new Transform(
transform: Matrix3.makeRotate(Mathf.PI / 2),
child: handle
));
case TextSelectionHandleType.right: // points up-left
return(handle);
case TextSelectionHandleType.collapsed: // points up
return(new Transform(
transform: Matrix3.makeRotate(Mathf.PI / 4),
child: handle
));
}
return(null);
}
public override Offset getHandleAnchor(TextSelectionHandleType type, float textLineHeight)
{
Size handleSize = getHandleSize(textLineHeight);
switch (type)
{
case TextSelectionHandleType.left:
return(new Offset(
handleSize.width / 2,
handleSize.height
));
case TextSelectionHandleType.right:
return(new Offset(
handleSize.width / 2,
handleSize.height - 2 * CupertinoTextSelectionUtils._kSelectionHandleRadius + CupertinoTextSelectionUtils._kSelectionHandleOverlap
));
default:
return(new Offset(
handleSize.width / 2,
textLineHeight + (handleSize.height - textLineHeight) / 2
));
}
}
public override Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight)
{
Size desiredSize = getHandleSize(textLineHeight);
Widget handle = SizedBox.fromSize(
size: desiredSize,
child: new CustomPaint(
painter: new _TextSelectionHandlePainter(CupertinoTheme.of(context).primaryColor)
)
);
var result = Matrix4.identity();
result.translate(desiredSize.width / 2, desiredSize.height / 2);
result.rotateZ(Mathf.PI);
result.translate(-desiredSize.width / 2, -desiredSize.height / 2);
switch (type)
{
case TextSelectionHandleType.left:
return(handle);
case TextSelectionHandleType.right:
return(new Transform(
transform: result,
child: handle
));
case TextSelectionHandleType.collapsed:
return(new SizedBox());
}
D.assert(type != null);
return(null);
}
public override Widget buildHandle(BuildContext context, TextSelectionHandleType type, double textLineHeight)
{
Widget handle = new Padding(
padding: EdgeInsets.only(right: 26.0, bottom: 26.0),
child: new SizedBox(
width: 20,
height: 20,
child: new CustomPaint(
painter: new _TextSelectionHandlePainter(
color: new Color(0xFFFF0000)
)
)
)
);
switch (type)
{
case TextSelectionHandleType.left: // points up-right
return(new Transform(
transform: Matrix3.makeRotate(Mathf.PI / 2),
child: handle
));
case TextSelectionHandleType.right: // points up-left
return(handle);
case TextSelectionHandleType.collapsed: // points up
return(new Transform(
transform: Matrix3.makeRotate(Mathf.PI / 4),
child: handle
));
}
return(null);
}
public override Widget build(BuildContext context)
{
List <TextSelectionPoint> endpoints =
this.widget.renderObject.getEndpointsForSelection(this.widget.selection);
Offset point = null;
TextSelectionHandleType type = TextSelectionHandleType.left;
switch (this.widget.position)
{
case _TextSelectionHandlePosition.start:
point = endpoints[0].point;
type = this._chooseType(endpoints[0], TextSelectionHandleType.left, TextSelectionHandleType.right);
break;
case _TextSelectionHandlePosition.end:
D.assert(endpoints.Count == 2);
point = endpoints[1].point;
type = this._chooseType(endpoints[1], TextSelectionHandleType.right, TextSelectionHandleType.left);
break;
}
Size viewport = this.widget.renderObject.size;
point = new Offset(
point.dx.clamp(0.0f, viewport.width),
point.dy.clamp(0.0f, viewport.height)
);
return(new CompositedTransformFollower(
link: this.widget.layerLink,
showWhenUnlinked: false,
child: new FadeTransition(
opacity: this._opacity,
child: new GestureDetector(
dragStartBehavior: this.widget.dragStartBehavior,
onPanStart: this._handleDragStart,
onPanUpdate: this._handleDragUpdate,
onTap: this._handleTap,
child: new Stack(
overflow: Overflow.visible,
children: new List <Widget>()
{
new Positioned(
left: point.dx,
top: point.dy,
child: this.widget.selectionControls.buildHandle(context, type,
this.widget.renderObject.preferredLineHeight)
)
}
)
)
)
));
}
public override Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight)
{
Size desiredSize = new Size(
2.0f * CustomTextSelectionControlsUtils._kHandlesPadding,
textLineHeight + 2.0f * CustomTextSelectionControlsUtils._kHandlesPadding
);
Widget handle = SizedBox.fromSize(
size: desiredSize,
child: new CustomPaint(
painter: new _TextSelectionHandlePainter(
new Offset(
CustomTextSelectionControlsUtils._kHandlesPadding,
textLineHeight + CustomTextSelectionControlsUtils._kHandlesPadding
)
)
)
);
switch (type)
{
case TextSelectionHandleType.left: {
Matrix3 matrix3 = Matrix3.makeRotate(Mathf.PI);
matrix3.preConcat(
Matrix3.makeTrans(
-CustomTextSelectionControlsUtils._kHandlesPadding,
-CustomTextSelectionControlsUtils._kHandlesPadding
)
);
return(new Transform(
transform: matrix3,
child: handle
));
}
case TextSelectionHandleType.right: {
return(new Transform(
transform: Matrix3.makeTrans(
-CustomTextSelectionControlsUtils._kHandlesPadding,
-(textLineHeight + CustomTextSelectionControlsUtils._kHandlesPadding)
),
child: handle
));
}
case TextSelectionHandleType.collapsed:
return(new Container());
default:
return(null);
}
}
public override Offset getHandleAnchor(TextSelectionHandleType type, float textLineHeight)
{
switch (type)
{
case TextSelectionHandleType.left:
return(new Offset(MaterialUtils._kHandleSize, 0));
case TextSelectionHandleType.right:
return(Offset.zero);
default:
return(new Offset(MaterialUtils._kHandleSize / 2, -4));
}
}
public override Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight)
{
Size desiredSize = new Size(
2.0f * CupertinoTextSelectionUtils._kHandlesPadding,
textLineHeight + 2.0f * CupertinoTextSelectionUtils._kHandlesPadding
);
Widget handle = SizedBox.fromSize(
size: desiredSize,
child: new CustomPaint(
painter: new _TextSelectionHandlePainter(
origin: new Offset(CupertinoTextSelectionUtils._kHandlesPadding,
textLineHeight + CupertinoTextSelectionUtils._kHandlesPadding)
)
)
);
switch (type)
{
case TextSelectionHandleType.left:
Matrix4 matrix = new Matrix4().rotationZ(Mathf.PI);
matrix.translate(-CupertinoTextSelectionUtils._kHandlesPadding,
-CupertinoTextSelectionUtils._kHandlesPadding);
return(new Transform(
transform: matrix,
child: handle
));
case TextSelectionHandleType.right:
return(new Transform(
transform: new Matrix4().translationValues(
-CupertinoTextSelectionUtils._kHandlesPadding,
-(textLineHeight + CupertinoTextSelectionUtils._kHandlesPadding),
0
),
child: handle
));
case TextSelectionHandleType.collapsed:
return(new Container());
}
return(null);
}
TextSelectionHandleType _chooseType(
TextSelectionPoint endpoint,
TextSelectionHandleType ltrType,
TextSelectionHandleType rtlType
)
{
if (this.widget.selection.isCollapsed)
{
return(TextSelectionHandleType.collapsed);
}
D.assert(endpoint.direction != null);
switch (endpoint.direction)
{
case TextDirection.ltr:
return(ltrType);
case TextDirection.rtl:
return(rtlType);
}
D.assert(() => throw new UIWidgetsError($"invalid endpoint.direction {endpoint.direction}"));
return(ltrType);
}
public abstract Widget buildHandle(BuildContext context, TextSelectionHandleType type, float textLineHeight);
public override Widget build(BuildContext context)
{
LayerLink layerLink = null;
TextSelectionHandleType type = TextSelectionHandleType.left;
switch (widget.position)
{
case _TextSelectionHandlePosition.start:
layerLink = widget.startHandleLayerLink;
type = _chooseType(
widget.renderObject.textDirection,
TextSelectionHandleType.left,
TextSelectionHandleType.right
);
break;
case _TextSelectionHandlePosition.end:
D.assert(!widget.selection.isCollapsed);
layerLink = widget.endHandleLayerLink;
type = _chooseType(
widget.renderObject.textDirection,
TextSelectionHandleType.right,
TextSelectionHandleType.left
);
break;
}
Offset handleAnchor = widget.selectionControls.getHandleAnchor(
type,
widget.renderObject.preferredLineHeight
);
Size handleSize = widget.selectionControls.getHandleSize(
widget.renderObject.preferredLineHeight
);
Rect handleRect = Rect.fromLTWH(
-handleAnchor.dx,
-handleAnchor.dy,
handleSize.width,
handleSize.height
);
Rect interactiveRect = handleRect.expandToInclude(
Rect.fromCircle(center: handleRect.center, radius: kMinInteractiveDimension / 2)
);
RelativeRect padding = RelativeRect.fromLTRB(
Mathf.Max((interactiveRect.width - handleRect.width) / 2, 0),
Mathf.Max((interactiveRect.height - handleRect.height) / 2, 0),
Mathf.Max((interactiveRect.width - handleRect.width) / 2, 0),
Mathf.Max((interactiveRect.height - handleRect.height) / 2, 0)
);
return(new CompositedTransformFollower(
link: layerLink,
offset: interactiveRect.topLeft,
showWhenUnlinked: false,
child: new FadeTransition(
opacity: _opacity,
child: new Container(
alignment: Alignment.topLeft,
width: interactiveRect.width,
height: interactiveRect.height,
child: new GestureDetector(
behavior: HitTestBehavior.translucent,
dragStartBehavior: widget.dragStartBehavior,
onPanStart: _handleDragStart,
onPanUpdate: _handleDragUpdate,
onTap: _handleTap,
child: new Padding(
padding: EdgeInsets.only(
left: padding.left,
top: padding.top,
right: padding.right,
bottom: padding.bottom
),
child: widget.selectionControls.buildHandle(context, type,
widget.renderObject.preferredLineHeight)
)
)
)
)
));
}
public abstract Offset getHandleAnchor(TextSelectionHandleType type, float textLineHeight);
public override Offset getHandleAnchor(TextSelectionHandleType type, float textLineHeight)
{
return(Offset.zero);
}
